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If each module could be imported several times, you would end up with a problem here. The module clientdb would import billing, which again imports clientdb, which . . . you get the picture. You get an endless loop of imports (endless recursion, remember ). However, because nothing happens the second time you import the module, the loop is broken. If you insist on reloading your module, you can use the built-in function reload. It takes a single argument (the module you want to reload) and returns the reloaded module. This may be useful if you have made changes to your module and want those changes reflected in your program while it is running. To reload the simple hello module (containing only a print statement), you would use the following: >>> hello = reload(hello) Hello, world! Here I assume that hello has already been imported (once). By assigning the result of reload to hello, I have replaced the previous version with the reloaded one. As you can see from the printed greeting, I am really importing the module here. Note that if you ve created an object using a given module and you then reload that module, your object will not be re-created. If you want your object to be based on the reloaded module, you will have to create it anew.

Now, if you access any of the pages where we display a book and the tags, the tags should be clickable and point to the show tag page. A good place for putting a link to the tag list page would be the menu. To do this, add the following code to application.rhtml: <li><a <li><a <li><a <li><a href="/admin/book">Books</a> | </li> href="/tag/list">Tags</a> | </li> href="/">Catalog</a> | </li> href="/about">About</a> </li>

Method: sales_order_shipment.addTrack ($shipment_increment_id, $carrier_key, $tracking_title, $tracking_num)

So modules are executed the first time they are imported into your program. That seems sort of useful but not very. What makes them worthwhile is that they (just like classes) keep their scope around afterward. That means that any class or function you define, and any variable you assign a value to, become attributes of the module. This may seem complicated, but in practice it is very simple. Let s say you have written a module like the one in Listing 10-2 and stored it in a file called hello2.py. Also assume that you ve put it in a place where the Python interpreter can find it, either using the sys.path trick from the previous section, or the more conventional methods from the section Making Your Modules Available, which follows. Listing 10-2. A Simple Module Containing a Function # hello2.py def hello(): print "Hello, world!" You can then import it like this: >>> import hello2 The module is then executed, which means that the function hello is defined in the scope of the module, which means that you can access the function like this: >>> hello2.hello() Hello, world! Any name defined in the global scope of the module will be available in the same manner.

Description: Adds a tracking number to the shipment order. Return: Int, newly created tracking id. Arguments: $shipment_increment_id (required). This is the shipment increment id. $carrier_key (required). Can be obtained by the sales_order_shipment.getCarriers() API. $tracking_title (required). Title that will appear on tracking info. $tracking_num (required). Tracking number.

Recall that the Recommend Books user story describes how George wants to be able to automatically recommend related books to customers. The acts_as_taggable gem has two methods that we can use for implementing this functionality: book.tagged_related: We can use this instance method to display books that share one or more of the same tags, and that are related to the current book being displayed to the customer. Book.find_related_tags: We can use this class method to recommend books that use tags that are related to the tags used by the currently displayed book.

// Prepare the data $shipment_increment_id = '200000001'; $carrier = 'fedex'; $tracking_title = 'Fedex Tracking Info'; $tracking_num = '111222333'; // Create tracking order $new_tracking_id = $client->call('call', array($session_id, 'sales_order_shipment.addTrack',

Why would you want to do this, you may wonder. Why not just define everything in your main program The primary reason is code reuse. If you put your code in a module, you can use it in more than one of your programs, which means that if you write a good client database and put it in a module called clientdb, you can use it both when billing, when sending out spam (though I hope you won t), and in any program that needs access to your client data. If you hadn t put this in a separate module, you would have to rewrite the code in each one of these programs. So, remember: To make your code reusable, make it modular! (And, yes, this is definitely related to abstraction.)